hdfs corruption appended to blocks is not detected by fs commands or fsck
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                 Key: HDFS-2848
                 URL: https://issues.apache.org/jira/browse/HDFS-2848
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 0.23.0
            Reporter: Ravi Prakash
            Assignee: Ravi Prakash


Courtesy Pat White
{quote}
Appears that there is a regression in corrupt block detection by both fsck and 
fs cmds like 'cat'. Testcases for
pre-block and block-overwrite corruption of all replicas is correctly reporting 
errors however post-block corruption is
not, fsck on the filesystem reports it's Healthy and 'cat' returns without 
error. Looking at the DN blocks themselves,
they clearly contain the injected corruption pattern.
{quote}

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